The set of conditions something must satisfy in order to produce an effective and ecological outcome. In NLP a particular goal is well-formed if it can be:
(1) stated in positive terms,
(2) defined and evaluated according to sensory based evidence,
(3) initiated and maintained by the person who desires the goal,
(4) made to preserve the positive by-products of the present state, and
(5) appropriately contextualized to fit the external ecology.